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Analog eLab Webcast

Texas Instruments Incorporated (TI) (NYSE: TXN) and Avnet Electronics Marketing Americas are offering a live Analog eLab(TM) Webcast for designers. The webinar is titled “Filter Design for PWM Systems, Digital Audio vs. Switching Supplies” and will take place on Wednesday, October 10, 2007, at 11:00 a.m. CDT (18:00 hrs CET). The event will highlight how the function of an L-C filter is modified when used with a power converter or a Class-D amplifier. The online seminar will discuss how to maximize performance of the L-C filter in various designs.

One of the most important circuit blocks used with a power converter or Class-D amplifier is the L-C filter. When used in a power converter application, the filter stores the energy, which is then bucked to a lower voltage or boosted to a higher voltage. When used in a Class-D amplifier application, the output L-C filter improves the audio quality. This is accomplished by removing the carrier frequency and out-of-band noise, facilitating EMC compliance by attenuating the RF component of the switching waveform and improving the reliability by limiting di/dt during a short-circuit error condition.

During the lab session, the panelists will highlight the key parameters in the L-C filter design for the two applications and offer a simplified approach to the L-C filter design for the Class-D amplifier. Through simulation and a lab experiment, the panelists will illustrate the effect of correct and incorrect inductor selection in the output filter of a Class-D amplifier.